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.IX Title "BN_cmp 3"
.TH BN_cmp 3 2019-12-20 1.0.2u OpenSSL
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH NAME
BN_cmp, BN_ucmp, BN_is_zero, BN_is_one, BN_is_word, BN_is_odd \- BIGNUM comparison and test functions
.SH SYNOPSIS
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/bn.h>
\&
\& int BN_cmp(BIGNUM *a, BIGNUM *b);
\& int BN_ucmp(BIGNUM *a, BIGNUM *b);
\&
\& int BN_is_zero(BIGNUM *a);
\& int BN_is_one(BIGNUM *a);
\& int BN_is_word(BIGNUM *a, BN_ULONG w);
\& int BN_is_odd(BIGNUM *a);
.Ve
.SH DESCRIPTION
.IX Header "DESCRIPTION"
\&\fBBN_cmp()\fR compares the numbers \fBa\fR and \fBb\fR. \fBBN_ucmp()\fR compares their
absolute values.
.PP
\&\fBBN_is_zero()\fR, \fBBN_is_one()\fR and \fBBN_is_word()\fR test if \fBa\fR equals 0, 1,
or \fBw\fR respectively. \fBBN_is_odd()\fR tests if a is odd.
.PP
\&\fBBN_is_zero()\fR, \fBBN_is_one()\fR, \fBBN_is_word()\fR and \fBBN_is_odd()\fR are macros.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBBN_cmp()\fR returns \-1 if \fBa\fR < \fBb\fR, 0 if \fBa\fR == \fBb\fR and 1 if
\&\fBa\fR > \fBb\fR. \fBBN_ucmp()\fR is the same using the absolute values
of \fBa\fR and \fBb\fR.
.PP
\&\fBBN_is_zero()\fR, \fBBN_is_one()\fR \fBBN_is_word()\fR and \fBBN_is_odd()\fR return 1 if
the condition is true, 0 otherwise.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBbn\fR\|(3)
.SH HISTORY
.IX Header "HISTORY"
\&\fBBN_cmp()\fR, \fBBN_ucmp()\fR, \fBBN_is_zero()\fR, \fBBN_is_one()\fR and \fBBN_is_word()\fR are
available in all versions of SSLeay and OpenSSL.
\&\fBBN_is_odd()\fR was added in SSLeay 0.8.